PayPal has been having some serious technical issues over the last few days (see it's not just me). There's actually been quite a bit of news about it. As a result, online subscriptions have often been taking much longer than usual to become active.
If anybody has a problem with their subscription not activating, please either send me a prive message, or an email at firstname.lastname@example.org and I'll credit account without waiting for PayPal.
Hopefully they'll get their act together soon.